package com.account;

import java.util.Random;

/**
 * Created with IntelliJ IDEA.
 * User: lixiao
 * Created Date: 2020/10/29 9:32
 */
public class RandomMsg {


    /**
     * 获取字母随机数
     * @param length 字母长度
     * @return
     */
    public static String getCharRandom(int length) {
        String val = "";
        Random random = new Random();
        //参数length，表示生成几位随机数
        for (int i = 0; i < length; i++) {
            int temp = random.nextInt(2) % 2 == 0 ? 65 : 97;
            val += (char) (random.nextInt(26) + temp);
        }
        return val;
    }


    /**
     * 随机获取数字
     * @param length
     * @return
     */
    public static String getNUmRandom(int length) {
        String val = "";
        Random random = new Random();
        //参数length，表示生成几位随机数
        for (int i = 0; i < length; i++) {
            val += String.valueOf(random.nextInt(10));
        }
        return val;
    }

    /**
     * 随机获取数字加字母
     * @param length
     * @return
     */
    public static String getNUmAndCharRandom(int length) {
        String val = "";
        Random random = new Random();
        //参数length，表示生成几位随机数
        for (int i = 0; i < length; i++) {
            String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";
            //输出字母还是数字
            if ("char".equalsIgnoreCase(charOrNum)) {
                //输出是大写字母还是小写字母
                int temp = random.nextInt(2) % 2 == 0 ? 65 : 97;
                val += (char) (random.nextInt(26) + temp);
            } else if ("num".equalsIgnoreCase(charOrNum)) {
                val += String.valueOf(random.nextInt(10));
            }
        }
        return val;
    }

    public static void main(String[] args) {
        System.out.println(RandomMsg.getNUmRandom(2));
    }

}